new to me - Porsche Design by IWC auto. Gold rotor?

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I have just bought a 3520 PD by IWC watch. Taking the back off I found the movement stamped 37524, which I understand is based on the ETA 2982-2. But I read this has a 21K gold rotor? Is this true? Seems strange to make the case from Titanium and the rotor from heavy gold, especially with no display back. Is Ranfft right on the rotor?